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The aim of this study was to determine whether early changes in serum markers of bone resorption could predict long-term responses in bone mineral density (BMD) after alendronate therapy in elderly women. One hundred and twenty women (mean age, 70 yr) were randomized to alendronate or placebo in this double blind, placebo-controlled clinical trial for 2.5 yr. Outcome measures were hip and spine BMD and biochemical markers of bone resorption, including serum N-telopeptide and C-telopeptide cross-linked collagen type I (NTx and CTx, respectively). Serum NTx and CTx were highly correlated at baseline (r = 0.73; P &lt; 0.001) and remained so throughout the study (range, r = 0.36-0.56; all P &lt; 0.05). After treatment with alendronate, serum NTx decreased 30.4+/-16.0% at 6 months, reaching a nadir of -36.7+/-18.0% by 24 months (P &lt; 0.001). Serum CTx decreased 43.5+/-67.0% at 6 months and continued to decrease to 67.3+/-19.3% at 2.5 yr (P &lt; 0.001). Moreover, decreases in serum NTx and CTx at 6 months were correlated with long-term improvements in vertebral BMD at 2.5 yr in patients receiving alendronate therapy (NTx: r = -0.42; CTx: r = -0.31; both P &lt; 0.05). We conclude that early changes in serum NTx and CTx, markers of bone resorption, predict long-term changes in vertebral BMD in elderly women receiving alendronate therapy and provide a useful tool to assess skeletal health.

the journal of clinical endocrinology and metabolism/journal of clinical endocrinology and metabolism

Early Changes in Serum N-Telopeptide and C-Telopeptide Cross-Linked Collagen Type 1 Predict Long-Term Response to Alendronate Therapy in Elderly Women<sup>1</sup>

Early Changes in Serum N-Telopeptide and C-Telopeptide Cross-Linked Collagen Type 1 Predict Long-Term Response to Alendronate Therapy in Elderly Women1

Early Changes in Serum N-Telopeptide and C-Telopeptide Cross-Linked Collagen Type 1 Predict Long-Term Response to Alendronate Therapy in Elderly Women¹